How to repair the leakage of the three piece fixed ball valve

Here are some of the well-known brands recognized in the valve industry, which are widely recognized and have a high reputation. While rankings may vary depending on time and market conditions, the following brands are generally considered to be among the top brands in the valve industry:

The following influential first-line brands of water system valves and industrial valves can be used as a reference, but for reference only: Suzhou Neway Valve, Shanghai Guanlong Valve, Shanghai Qizhong Valve, Sanhua, Su Yan, Shentong, Su Valve, Nanfang, Jiang.

First, the word Yao. The above manufacturers are only estimates and references, and the specific situation may vary or fluctuate at any time due to changes in a series of factors such as changes in the market, the size of the competition pattern, and the stability of product quality. As an indispensable key device in industrial production and civil facilities, the quality and reputation of the valve brand directly affect the satisfaction and trust of users.

These brands are known in the valve industry for their innovative technology, high-quality products and reliability. It is important to note that the market and industry are evolving rapidly, and different rankings may vary depending on time and region. For the most up-to-date ranking information, it is recommended to refer to industry reports, professional organizations or market research data for more detailed and accurate information.

Hello, is it **leak? Ball valve is divided into external leakage and internal leakage, you have to determine that it is the best leakage and then consider how to repair, the external leakage is the packing seal is not tight, directly change the packing, the internal leakage is caused by the change of the valve seat, you can replace the valve seat.

<> working principle of three-piece ball valves.

a. Opening process.

1. In the closed position, the ball is pressed on the valve seat by the mechanical pressure of the valve stem.

2. When the handwheel is rotated counterclockwise, the valve with the ballast rod moves in the opposite direction, and its bottom angular plane makes the ball disengage from the passenger valve seat.

3. The stem continues to lift and interacts with the guide pin in the spiral groove of the stem so that the ball begins to rotate frictionlessly.

4. Until it reaches the fully open position, the valve stem is lifted to the limit position, and the ball rotates to the fully open position.

b. Closing process.

1. When closing, rotate the handwheel clockwise, and the valve stem begins to descend and make the ball leave the valve seat and start rotating.

2. Continue to rotate the handwheel, and the valve stem is affected by the guide pin embedded in the spiral groove on it, so that the valve stem and the ball rotate 90° at the same time.

3 When it was about to close, the ball had been rotated 90° without contact with the valve seat.

4. In the last few turns of the handwheel, the angular plane at the bottom of the stem is mechanically wedged to compress the ball so that it is tightly pressed against the valve seat to achieve a complete seal.

Precautions for installation and maintenance of three-piece ball valves.

1.Leave a position for the stem to rotate.

2.It cannot be used as a throttling.

3. The ball valve with the transmission mechanism should be installed upright.

When the ferrule ball valve is closed, there is still a pressurized fluid inside the valve body.

Before servicing the ferrule ball valve, relieve the line pressure and keep the valve in the open position.

Before repairing, disconnect the power supply or air supply.

Before repair, disengage the actuator from the bracket.

It is necessary to find out that the pressure of the upper and downstream pipelines of the ferrule ball valve has been relieved before the disassembly and decomposition operation can be carried out.

Care must be taken to prevent damage to the sealing surface of the parts, especially non-metallic parts, and special tools should be used when removing the O-ring.

The bolts on the flange must be tightened symmetrically, gradually and evenly during ball valve assembly.

The cleaning agent should be compatible with the rubber, plastic, metal and working medium (e.g. gas) in the ball valve. When the working medium is gas, the metal parts can be cleaned with gasoline. Non-metallic parts are cleaned with purified water or alcohol.

The individual parts that have been disassembled can be cleaned by dipping. Metal parts that still have undecomposed non-metallic parts can be scrubbed with a clean, fine cloth impregnated with detergent (to prevent the fibers from falling off and sticking to the parts). When cleaning, all grease, dirt, glue, dust, etc. adhered to the wall must be removed.

Non-metallic parts should be removed from the cleaning agent immediately after cleaning, and should not be soaked for a long time.

After cleaning, it is necessary to assemble after the washed wall cleaning agent volatilizes (you can wipe it with a silk cloth that is not soaked in cleaning agent), but it should not be left for a long time, otherwise it will rust and be polluted by dust.

New parts also need to be cleaned before assembly.

Lubricate with grease. The grease should be compatible with the metal materials, rubber parts, plastic parts and working medium of the ball valve. When the working medium is gas, e.g. special 221 grease can be used.

Apply a thin layer of grease to the surface of the seal mounting groove, a thin layer of grease to the rubber seal, and a thin layer of grease to the sealing surface and friction surface of the valve stem.

During assembly, metal chips, fibers, grease (except for specified use), dust and other impurities, foreign bodies, etc. should not be allowed to contaminate, adhere or stay on the surface of the parts or enter the inner cavity.